University of Twente Student Theses


An improved bending model for thermoplastic composites in forming processes

Voormolen, M.S. (2015) An improved bending model for thermoplastic composites in forming processes.

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Abstract:The purpose of this research is to elaborate a mathematical model that describes the visco-elastic bending behavior of a thermoplastic composite specimen during thermoforming processes. The mathematical model was derived from a simplified physical model which represents a layered composite material of alternating elastic and viscous layers. In a previous research the viscous layers are assumed to be from Newtonian fluid, having a constant shear viscosity, while the elastic layers are linear elastic. This resulted in a mathematical model in form of the diffusion equation, describing a diffusive-like behavior of the deflection angles in the beam. Because polymeric melts exhibit in general a shear thinning behavior, the diffusion equation in this research is improved by including the shear rate dependency of the melt viscosity. Therefore, the diffusion equation became a non-linear differential equation, which is solved numerically by means of the finite difference method. This research shows the significance of the shear thinning behavior in the model by comparing the bending deformation of the composite beam obtained with a constant viscosity and a shear-thinning viscosity.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:52 mechanical engineering
Programme:Advanced Technology BSc (50002)
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